The Magellan's Crane is Metal Gear Rex's Railgun

This Magellan model kit is out for preorder and I was scrolling through the kit promotional photos. It looks like the Crane arm also transforms into a very on the nose nod to Rex's rail gun.

It's not a 1:1 copy for obvious reasons but the nod is there and it makes me wonder how this will work in-game.

You can see the rail gun barrel is a very short version of rex's long range nuke launcher. Pretty cool honestly.